Teflon Coated Buna-N (Nitrile) O-Rings
Dry film lubricants are often used as a base for applying color coding to parts for identity. This immensely enhances the ability to differentiate between similar parts or to verify existence of a part where otherwise hard to distinguish.
Coloring may also be decorative in some cases. When applied to many parts the film is also assistance in passage through automated equipment or an assembly process.
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